People who think their house is small might not complain after meeting Christopher Smith and Merete Mueller from Boulder, Colorado. The couple just completed building their dream home- a tiny house, totaling 125 square feet.

Mueller and Smith set out to create this very small house in an effort to minimize their environmental impact. And their house isn't just small, it is also full of green innovations to reduce the couple's footprint.

The windows are reclaimed and the house runs on solar power. The wood used to construct the house is beetle-kill wood- which is wood from trees that have been killed naturally, by pine beetles. Perhaps even more unusual, the toilet does not rely on traditional plumbing. Instead, the couple makes use of a composting toilet.

"It's just a five-gallon bucket that you put peat moss and sawdust in," Smith said. "You'd be surprised how well it works and how much it doesn't smell."

Smith and Mueller raised money for the project through Kickstarter. On their Kickstarter site the couple offered a video explaining their aspirations and the drive that lead to building their tiny house.

"When we first started this project, we were really surprised to learn that house sizes in America have almost doubled in the last 40 years. It seems that we're building bigger and fancier houses and consuming more resources to do so, but we don't necessarily feel more at home in them," Mueller said in the couple's Kickstarter video.

The couple also plans to release a documentary about the building of their house.

"The film is a meditation on the relationship of home to environment, of quality and simplicity to a life well lived," according to the documentary's website.